LanMountainDesktop/LanMontainDesktop/Views/MainWindow.Settings.cs

using System;
using FluentIcons.Avalonia;
using FluentIcons.Common;

using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Media;
using Avalonia.Media.Imaging;
using Avalonia.Platform;
using Avalonia.Platform.Storage;
using Avalonia.Styling;
using Avalonia.Threading;
using LanMontainDesktop.Models;
using LanMontainDesktop.Services;
using LanMontainDesktop.Theme;
using LibVLCSharp.Shared;

namespace LanMontainDesktop.Views;

public partial class MainWindow
{
    private void OnOpenSettingsClick(object? sender, RoutedEventArgs e)
    {
        if (_isComponentLibraryOpen)
        {
            CloseComponentLibraryWindow(reopenSettings: false);
        }

        if (_isSettingsOpen)
        {
            CloseSettingsPage();
            return;
        }

        OpenSettingsPage();
    }

    private void OnCloseSettingsClick(object? sender, RoutedEventArgs e)
    {
        CloseSettingsPage();
    }

    private void OnSettingsNavSelectionChanged(object? sender, SelectionChangedEventArgs e)
    {
        UpdateSettingsTabContent();
        PersistSettings();
    }

    private void UpdateSettingsTabContent()
    {
        // SelectionChanged can fire during XAML initialization before all named controls are assigned.
        if (SettingsNavListBox is null ||
            GridSettingsPanel is null ||
            WallpaperSettingsPanel is null ||
            ColorSettingsPanel is null ||
            StatusBarSettingsPanel is null ||
            RegionSettingsPanel is null)
        {
            return;
        }

        var selectedIndex = SettingsNavListBox.SelectedIndex;
        WallpaperSettingsPanel.IsVisible = selectedIndex == 0;
        GridSettingsPanel.IsVisible = selectedIndex == 1;
        ColorSettingsPanel.IsVisible = selectedIndex == 2;
        StatusBarSettingsPanel.IsVisible = selectedIndex == 3;
        RegionSettingsPanel.IsVisible = selectedIndex == 4;
        ApplyTaskbarActionVisibility(GetCurrentTaskbarContext());
    }

    private void OnNightModeChecked(object? sender, RoutedEventArgs e)
    {
        if (_suppressThemeToggleEvents)
        {
            return;
        }

        ApplyNightModeState(true, refreshPalettes: true);
    }

    private void OnNightModeUnchecked(object? sender, RoutedEventArgs e)
    {
        if (_suppressThemeToggleEvents)
        {
            return;
        }

        ApplyNightModeState(false, refreshPalettes: true);
    }

    private void OnRecommendedColorClick(object? sender, RoutedEventArgs e)
    {
        ApplyThemeColorFromButton(sender as Button, L("common.recommended", "Recommended"));
    }

    private void OnMonetColorClick(object? sender, RoutedEventArgs e)
    {
        ApplyThemeColorFromButton(sender as Button, L("common.monet", "Monet"));
    }

    private void OnRefreshMonetColorsClick(object? sender, RoutedEventArgs e)
    {
        RefreshColorPalettes();
        EnsureSelectedThemeColor();
        UpdateThemeColorSelectionState();
        ThemeColorStatusTextBlock.Text = L("settings.color.monet_refreshed", "Monet colors refreshed.");
        UpdateAdaptiveTextSystem();
        PersistSettings();
    }

    private async void OnPickWallpaperClick(object? sender, RoutedEventArgs e)
    {
        if (StorageProvider is null)
        {
            _wallpaperStatus = L("settings.wallpaper.storage_unavailable", "Storage provider is unavailable.");
            UpdateWallpaperDisplay();
            return;
        }

        var options = new FilePickerOpenOptions
        {
            Title = L("filepicker.title", "Select wallpaper"),
            AllowMultiple = false,
            FileTypeFilter =
            [
                new FilePickerFileType(L("filepicker.image_files", "Image files"))
                {
                    Patterns = ["*.png", "*.jpg", "*.jpeg", "*.bmp", "*.gif", "*.webp"]
                },
                new FilePickerFileType(L("filepicker.video_files", "Video files"))
                {
                    Patterns = ["*.mp4", "*.mkv", "*.webm", "*.avi", "*.mov", "*.m4v"]
                }
            ]
        };

        var files = await StorageProvider.OpenFilePickerAsync(options);
        if (files.Count == 0)
        {
            return;
        }

        var file = files[0];
        try
        {
            var importedPath = await ImportWallpaperAssetAsync(file);
            if (string.IsNullOrWhiteSpace(importedPath))
            {
                _wallpaperStatus = L("settings.wallpaper.import_failed", "Failed to import wallpaper file.");
                UpdateWallpaperDisplay();
                return;
            }

            _wallpaperPath = importedPath;
            var mediaType = DetectWallpaperMediaType(importedPath);
            switch (mediaType)
            {
                case WallpaperMediaType.Image:
                    _wallpaperBitmap?.Dispose();
                    _wallpaperBitmap = new Bitmap(importedPath);
                    _wallpaperVideoPath = null;
                    _wallpaperMediaType = WallpaperMediaType.Image;
                    _wallpaperStatus = L("settings.wallpaper.image_applied", "Image wallpaper applied.");
                    break;
                case WallpaperMediaType.Video:
                    _wallpaperBitmap?.Dispose();
                    _wallpaperBitmap = null;
                    _wallpaperVideoPath = importedPath;
                    _wallpaperMediaType = WallpaperMediaType.Video;
                    _wallpaperStatus = L("settings.wallpaper.video_applied", "Video wallpaper applied.");
                    break;
                default:
                    _wallpaperStatus = L("settings.wallpaper.unsupported_file", "Selected file type is not supported.");
                    UpdateWallpaperDisplay();
                    return;
            }

            ApplyWallpaperBrush();
            UpdateWallpaperDisplay();
            RefreshColorPalettes();
            EnsureSelectedThemeColor();
            UpdateThemeColorSelectionState();
            ThemeColorStatusTextBlock.Text = _wallpaperMediaType == WallpaperMediaType.Video
                ? L("settings.color.theme_updated_video", "Video wallpaper updated. Theme colors refreshed.")
                : L("settings.color.theme_updated_wallpaper", "Wallpaper updated. Monet colors refreshed.");
            PersistSettings();
        }
        catch (Exception ex)
        {
            _wallpaperStatus = Lf("settings.wallpaper.apply_failed_format", "Failed to apply wallpaper: {0}", ex.Message);
            UpdateWallpaperDisplay();
        }
    }

    private void OnClearWallpaperClick(object? sender, RoutedEventArgs e)
    {
        StopVideoWallpaper();
        _wallpaperVideoPath = null;
        _wallpaperMediaType = WallpaperMediaType.None;
        _wallpaperBitmap?.Dispose();
        _wallpaperBitmap = null;
        _wallpaperPath = null;
        _wallpaperStatus = L("settings.wallpaper.cleared", "Background reset to solid color.");
        ApplyWallpaperBrush();
        UpdateWallpaperDisplay();
        RefreshColorPalettes();
        EnsureSelectedThemeColor();
        UpdateThemeColorSelectionState();
        ThemeColorStatusTextBlock.Text = L("settings.color.theme_cleared_wallpaper", "Wallpaper cleared. Monet colors refreshed.");
        PersistSettings();
    }

    private void OnWallpaperPlacementSelectionChanged(object? sender, SelectionChangedEventArgs e)
    {
        ApplyWallpaperBrush();
        if (_wallpaperMediaType == WallpaperMediaType.Image && _wallpaperBitmap is not null)
        {
            _wallpaperStatus = Lf(
                "settings.wallpaper.mode_format",
                "Wallpaper mode: {0}.",
                GetLocalizedPlacementDisplayName(GetSelectedWallpaperPlacement()));
        }
        else if (_wallpaperMediaType == WallpaperMediaType.Video)
        {
            _wallpaperStatus = L("settings.wallpaper.video_mode", "Video wallpaper mode uses automatic fill mode.");
        }

        UpdateWallpaperDisplay();
        PersistSettings();
    }

    private void ApplyWallpaperBrush()
    {
        if (_wallpaperMediaType == WallpaperMediaType.Video &&
            !string.IsNullOrWhiteSpace(_wallpaperVideoPath))
        {
            DesktopWallpaperLayer.Background = Brushes.Transparent;
            WallpaperPreviewViewport.Background = GetThemeDefaultDesktopBackground();
            PlayVideoWallpaper(_wallpaperVideoPath);
            return;
        }

        StopVideoWallpaper();
        if (_wallpaperBitmap is null)
        {
            var fallbackBackground = GetThemeDefaultDesktopBackground();
            DesktopWallpaperLayer.Background = fallbackBackground;
            WallpaperPreviewViewport.Background = fallbackBackground;
            return;
        }

        var placement = GetSelectedWallpaperPlacement();
        DesktopWallpaperLayer.Background = CreateWallpaperBrush(_wallpaperBitmap, placement, false);
        WallpaperPreviewViewport.Background = CreateWallpaperBrush(_wallpaperBitmap, placement, true);
    }

    private void UpdateWallpaperDisplay()
    {
        if (WallpaperPathTextBlock is null ||
            WallpaperStatusTextBlock is null ||
            WallpaperPreviewViewport is null ||
            WallpaperPlacementComboBox is null)
        {
            return;
        }

        WallpaperPathTextBlock.Text = string.IsNullOrWhiteSpace(_wallpaperPath)
            ? L("settings.wallpaper.no_selection", "No wallpaper selected.")
            : Path.GetFileName(_wallpaperPath);
        WallpaperStatusTextBlock.Text = _wallpaperStatus;
        WallpaperPlacementComboBox.IsEnabled = _wallpaperMediaType != WallpaperMediaType.Video;

        if (_wallpaperMediaType == WallpaperMediaType.Video)
        {
            WallpaperPreviewViewport.Background = GetThemeDefaultDesktopBackground();
            return;
        }

        if (_wallpaperBitmap is null)
        {
            WallpaperPreviewViewport.Background = GetThemeDefaultDesktopBackground();
            return;
        }

        WallpaperPreviewViewport.Background = CreateWallpaperBrush(
            _wallpaperBitmap,
            GetSelectedWallpaperPlacement(),
            true);
    }

    private ImageBrush CreateWallpaperBrush(Bitmap bitmap, WallpaperPlacement placement, bool forPreview)
    {
        var brush = new ImageBrush
        {
            Source = bitmap,
            Stretch = Stretch.UniformToFill,
            AlignmentX = AlignmentX.Center,
            AlignmentY = AlignmentY.Center,
            TileMode = TileMode.None
        };

        if (forPreview)
        {
            // For preview, we want to simulate how the image looks on a real screen.
            // Assuming a nominal screen width of 1920 for calculation.
            // The preview width is 480, so the scale is 480/1920 = 0.25.
            const double nominalScreenWidth = 1920.0;
            const double previewWidth = 480.0;
            double scale = previewWidth / nominalScreenWidth;

            if (placement == WallpaperPlacement.Center)
            {
                brush.Transform = new ScaleTransform(scale, scale);
            }
        }

        switch (placement)
        {
            case WallpaperPlacement.Fill:
                brush.Stretch = Stretch.UniformToFill;
                break;
            case WallpaperPlacement.Fit:
                brush.Stretch = Stretch.Uniform;
                break;
            case WallpaperPlacement.Stretch:
                brush.Stretch = Stretch.Fill;
                break;
            case WallpaperPlacement.Center:
                brush.Stretch = Stretch.None;
                break;
            case WallpaperPlacement.Tile:
                brush.Stretch = Stretch.None;
                brush.TileMode = TileMode.Tile;
                var tileSize = forPreview ? 96d : 220d;
                brush.DestinationRect = new RelativeRect(0, 0, tileSize, tileSize, RelativeUnit.Absolute);
                break;
        }

        return brush;
    }

    private WallpaperPlacement GetSelectedWallpaperPlacement()
    {
        return WallpaperPlacementComboBox?.SelectedIndex switch
        {
            1 => WallpaperPlacement.Fit,
            2 => WallpaperPlacement.Stretch,
            3 => WallpaperPlacement.Center,
            4 => WallpaperPlacement.Tile,
            _ => WallpaperPlacement.Fill
        };
    }

    private static string GetPlacementDisplayName(WallpaperPlacement placement)
    {
        return placement switch
        {
            WallpaperPlacement.Fill => "Fill",
            WallpaperPlacement.Fit => "Fit",
            WallpaperPlacement.Stretch => "Stretch",
            WallpaperPlacement.Center => "Center",
            WallpaperPlacement.Tile => "Tile",
            _ => "Fill"
        };
    }

    private IBrush GetThemeDefaultDesktopBackground()
    {
        if (Resources.TryGetResource("AdaptiveSurfaceBaseBrush", ActualThemeVariant, out var resource) &&
            resource is IBrush themedBrush)
        {
            return themedBrush;
        }

        return _defaultDesktopBackground ??
               (_isNightMode
                   ? new SolidColorBrush(Color.Parse("#FF0B1220"))
                   : new SolidColorBrush(Color.Parse("#FFF3F7FB")));
    }

    private static int GetPlacementIndexFromSetting(string? placement)
    {
        if (string.IsNullOrWhiteSpace(placement))
        {
            return 0;
        }

        return placement.Trim().ToLowerInvariant() switch
        {
            "fit" => 1,
            "stretch" => 2,
            "center" => 3,
            "tile" => 4,
            _ => 0
        };
    }

    private void TryRestoreWallpaper(string? savedWallpaperPath)
    {
        StopVideoWallpaper();
        _wallpaperMediaType = WallpaperMediaType.None;
        _wallpaperVideoPath = null;
        _wallpaperBitmap?.Dispose();
        _wallpaperBitmap = null;
        _wallpaperPath = null;

        if (string.IsNullOrWhiteSpace(savedWallpaperPath))
        {
            _wallpaperStatus = L("settings.wallpaper.default_status", "Current background uses solid color.");
            return;
        }

        if (!Path.IsPathRooted(savedWallpaperPath) || !File.Exists(savedWallpaperPath))
        {
            _wallpaperStatus = L(
                "settings.wallpaper.saved_not_found",
                "Saved wallpaper file was not found. Using solid color background.");
            return;
        }

        try
        {
            var mediaType = DetectWallpaperMediaType(savedWallpaperPath);
            switch (mediaType)
            {
                case WallpaperMediaType.Image:
                    _wallpaperBitmap = new Bitmap(savedWallpaperPath);
                    _wallpaperPath = savedWallpaperPath;
                    _wallpaperMediaType = WallpaperMediaType.Image;
                    _wallpaperStatus = L("settings.wallpaper.restored", "Wallpaper restored from saved settings.");
                    break;
                case WallpaperMediaType.Video:
                    _wallpaperVideoPath = savedWallpaperPath;
                    _wallpaperPath = savedWallpaperPath;
                    _wallpaperMediaType = WallpaperMediaType.Video;
                    _wallpaperStatus = L("settings.wallpaper.video_restored", "Video wallpaper restored from saved settings.");
                    break;
                default:
                    _wallpaperStatus = L(
                        "settings.wallpaper.unsupported_file",
                        "Saved wallpaper type is not supported. Using solid color background.");
                    break;
            }
        }
        catch
        {
            _wallpaperStatus = L(
                "settings.wallpaper.restore_failed",
                "Failed to restore saved wallpaper. Using solid color background.");
            _wallpaperBitmap?.Dispose();
            _wallpaperBitmap = null;
            _wallpaperMediaType = WallpaperMediaType.None;
            _wallpaperVideoPath = null;
            _wallpaperPath = null;
        }
    }

    private static bool TryParseColor(string? colorText, out Color color)
    {
        color = default;
        if (string.IsNullOrWhiteSpace(colorText))
        {
            return false;
        }

        try
        {
            color = Color.Parse(colorText);
            return true;
        }
        catch
        {
            return false;
        }
    }

    private static WallpaperMediaType DetectWallpaperMediaType(string path)
    {
        var extension = Path.GetExtension(path);
        if (string.IsNullOrWhiteSpace(extension))
        {
            return WallpaperMediaType.None;
        }

        if (SupportedImageExtensions.Contains(extension))
        {
            return WallpaperMediaType.Image;
        }

        if (SupportedVideoExtensions.Contains(extension))
        {
            return WallpaperMediaType.Video;
        }

        return WallpaperMediaType.None;
    }

    private static async Task<string?> ImportWallpaperAssetAsync(IStorageFile file)
    {
        try
        {
            var extension = Path.GetExtension(file.Name);
            if (string.IsNullOrWhiteSpace(extension))
            {
                extension = ".bin";
            }

            var appData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
            var wallpaperDirectory = Path.Combine(appData, "LanMontainDesktop", "Wallpapers");
            Directory.CreateDirectory(wallpaperDirectory);

            var destinationPath = Path.Combine(
                wallpaperDirectory,
                $"{DateTime.Now:yyyyMMdd_HHmmss}_{Guid.NewGuid():N}{extension}");

            await using var sourceStream = await file.OpenReadAsync();
            await using var destinationStream = File.Create(destinationPath);
            await sourceStream.CopyToAsync(destinationStream);
            return destinationPath;
        }
        catch
        {
            return null;
        }
    }

    private void EnsureVideoWallpaperPlayers()
    {
        Core.Initialize();
        _libVlc ??= new LibVLC("--quiet");

        if (_videoWallpaperPlayer is null && DesktopVideoWallpaperView is not null)
        {
            _videoWallpaperPlayer = new MediaPlayer(_libVlc);
            DesktopVideoWallpaperView.MediaPlayer = _videoWallpaperPlayer;
        }

        if (_previewVideoWallpaperPlayer is null && WallpaperPreviewVideoView is not null)
        {
            _previewVideoWallpaperPlayer = new MediaPlayer(_libVlc);
            WallpaperPreviewVideoView.MediaPlayer = _previewVideoWallpaperPlayer;
        }
    }

    private void PlayVideoWallpaper(string videoPath)
    {
        if (!File.Exists(videoPath))
        {
            _wallpaperStatus = L("settings.wallpaper.video_not_found", "Video wallpaper file not found.");
            StopVideoWallpaper();
            return;
        }

        try
        {
            EnsureVideoWallpaperPlayers();
            if (_videoWallpaperPlayer is null ||
                _previewVideoWallpaperPlayer is null ||
                _libVlc is null ||
                DesktopVideoWallpaperView is null ||
                WallpaperPreviewVideoView is null)
            {
                _wallpaperStatus = L("settings.wallpaper.video_player_unavailable", "Video player is unavailable.");
                StopVideoWallpaper();
                return;
            }

            _videoWallpaperMedia?.Dispose();
            _previewVideoWallpaperMedia?.Dispose();
            _videoWallpaperMedia = new Media(_libVlc, new Uri(videoPath));
            _previewVideoWallpaperMedia = new Media(_libVlc, new Uri(videoPath));
            _videoWallpaperMedia.AddOption(":input-repeat=65535");
            _previewVideoWallpaperMedia.AddOption(":input-repeat=65535");
            _videoWallpaperPlayer.Play(_videoWallpaperMedia);
            _previewVideoWallpaperPlayer.Play(_previewVideoWallpaperMedia);
            DesktopVideoWallpaperView.IsVisible = true;
            WallpaperPreviewVideoView.IsVisible = true;
        }
        catch (Exception ex)
        {
            _wallpaperStatus = Lf("settings.wallpaper.video_play_failed_format", "Failed to play video wallpaper: {0}", ex.Message);
            StopVideoWallpaper();
        }
    }

    private void StopVideoWallpaper()
    {
        if (DesktopVideoWallpaperView is not null)
        {
            DesktopVideoWallpaperView.IsVisible = false;
        }

        if (WallpaperPreviewVideoView is not null)
        {
            WallpaperPreviewVideoView.IsVisible = false;
        }

        if (_videoWallpaperPlayer?.IsPlaying == true)
        {
            _videoWallpaperPlayer.Stop();
        }

        if (_previewVideoWallpaperPlayer?.IsPlaying == true)
        {
            _previewVideoWallpaperPlayer.Stop();
        }

        _videoWallpaperMedia?.Dispose();
        _videoWallpaperMedia = null;
        _previewVideoWallpaperMedia?.Dispose();
        _previewVideoWallpaperMedia = null;
    }

    private void PersistSettings()
    {
        if (_suppressSettingsPersistence)
        {
            return;
        }

        var snapshot = new AppSettingsSnapshot
        {
            GridShortSideCells = _targetShortSideCells,
            IsNightMode = _isNightMode,
            ThemeColor = _selectedThemeColor.ToString(),
            WallpaperPath = _wallpaperPath,
            WallpaperPlacement = GetPlacementDisplayName(GetSelectedWallpaperPlacement()),
            SettingsTabIndex = Math.Max(0, SettingsNavListBox?.SelectedIndex ?? 0),
            LanguageCode = _languageCode,
            TopStatusComponentIds = _topStatusComponentIds.ToList(),
            PinnedTaskbarActions = _pinnedTaskbarActions.Select(action => action.ToString()).ToList(),
            EnableDynamicTaskbarActions = _enableDynamicTaskbarActions,
            TaskbarLayoutMode = _taskbarLayoutMode,
            DesktopPageCount = _desktopPageCount,
            CurrentDesktopSurfaceIndex = _currentDesktopSurfaceIndex
        };

        _appSettingsService.Save(snapshot);
    }

    private void UpdateAdaptiveTextSystem()
    {
        var isLightBackground = _isSettingsOpen
            ? !_isNightMode
            : CalculateCurrentBackgroundLuminance() >= LightBackgroundLuminanceThreshold;
        var isLightNavBackground = _isSettingsOpen
            ? !_isNightMode
            : CalculateBrushLuminance(SettingsNavPanelBorder?.Background) >= LightBackgroundLuminanceThreshold;
        var context = new ThemeColorContext(
            _selectedThemeColor,
            isLightBackground,
            isLightNavBackground,
            _isNightMode);

        ThemeColorSystemService.ApplyThemeResources(Resources, context);
        GlassEffectService.ApplyGlassResources(Resources, context);
        if (_fluentAvaloniaTheme is not null)
        {
            _fluentAvaloniaTheme.CustomAccentColor = _selectedThemeColor;
        }
    }

    private double CalculateCurrentBackgroundLuminance()
    {
        if (_isSettingsOpen)
        {
            return CalculateBrushLuminance(SettingsContentPanel?.Background ?? SettingsPage?.Background);
        }

        if (_wallpaperMediaType == WallpaperMediaType.Video)
        {
            return CalculateRelativeLuminance(Color.Parse("#FF0B1220"));
        }

        if (_wallpaperBitmap is not null)
        {
            return CalculateBitmapAverageLuminance(_wallpaperBitmap);
        }

        return CalculateBrushLuminance(DesktopWallpaperLayer.Background ?? _defaultDesktopBackground);
    }

    private void ApplyNightModeState(bool enabled, bool refreshPalettes)
    {
        _isNightMode = enabled;
        RequestedThemeVariant = enabled ? ThemeVariant.Dark : ThemeVariant.Light;
        UpdateThemeModeIcon();

        _suppressThemeToggleEvents = true;
        NightModeToggleSwitch.IsChecked = enabled;
        _suppressThemeToggleEvents = false;

        if (refreshPalettes)
        {
            RefreshColorPalettes();
            EnsureSelectedThemeColor();
        }

        UpdateThemeColorSelectionState();
        ThemeColorStatusTextBlock.Text = Lf(
            "settings.color.mode_status_format",
            "Theme mode: {0}.",
            enabled ? L("common.night", "Night") : L("common.day", "Day"));
        UpdateAdaptiveTextSystem();
        ApplyWallpaperBrush();
        PersistSettings();
    }

    private void RefreshColorPalettes()
    {
        var palette = _monetColorService.BuildPalette(_wallpaperBitmap, _isNightMode);
        _recommendedColors = palette.RecommendedColors;
        _monetColors = palette.MonetColors;
        ApplyColorPaletteToButtons(_recommendedColors, GetRecommendedColorTargets());
        ApplyColorPaletteToButtons(_monetColors, GetMonetColorTargets());
    }

    private void ApplyColorPaletteToButtons(
        IReadOnlyList<Color> colors,
        IReadOnlyList<(Button Button, Border Swatch)> targets)
    {
        for (var i = 0; i < targets.Count; i++)
        {
            var color = i < colors.Count
                ? colors[i]
                : Color.Parse("#00000000");
            var (button, swatch) = targets[i];
            button.Tag = color.ToString();
            button.IsEnabled = i < colors.Count;
            swatch.Background = i < colors.Count
                ? new SolidColorBrush(color)
                : new SolidColorBrush(Color.Parse("#00000000"));
        }
    }

    private IReadOnlyList<(Button Button, Border Swatch)> GetRecommendedColorTargets()
    {
        return
        [
            (RecommendedColorButton1, RecommendedColorSwatch1),
            (RecommendedColorButton2, RecommendedColorSwatch2),
            (RecommendedColorButton3, RecommendedColorSwatch3),
            (RecommendedColorButton4, RecommendedColorSwatch4),
            (RecommendedColorButton5, RecommendedColorSwatch5),
            (RecommendedColorButton6, RecommendedColorSwatch6)
        ];
    }

    private IReadOnlyList<(Button Button, Border Swatch)> GetMonetColorTargets()
    {
        return
        [
            (MonetColorButton1, MonetColorSwatch1),
            (MonetColorButton2, MonetColorSwatch2),
            (MonetColorButton3, MonetColorSwatch3),
            (MonetColorButton4, MonetColorSwatch4),
            (MonetColorButton5, MonetColorSwatch5),
            (MonetColorButton6, MonetColorSwatch6)
        ];
    }

    private void EnsureSelectedThemeColor()
    {
        if (ContainsColor(_recommendedColors, _selectedThemeColor) ||
            ContainsColor(_monetColors, _selectedThemeColor))
        {
            return;
        }

        if (_recommendedColors.Count > 0)
        {
            _selectedThemeColor = _recommendedColors[0];
            return;
        }

        if (_monetColors.Count > 0)
        {
            _selectedThemeColor = _monetColors[0];
        }
    }

    private void ApplyThemeColorFromButton(Button? button, string sourceLabel)
    {
        if (!TryGetButtonColor(button, out var color))
        {
            return;
        }

        _selectedThemeColor = color;
        UpdateThemeColorSelectionState();
        ThemeColorStatusTextBlock.Text = Lf(
            "settings.color.theme_applied_format",
            "{0} color applied: {1}.",
            sourceLabel,
            _selectedThemeColor);
        UpdateAdaptiveTextSystem();
        PersistSettings();
    }

    private void UpdateThemeColorSelectionState()
    {
        UpdateColorSelectionVisuals(GetRecommendedColorTargets());
        UpdateColorSelectionVisuals(GetMonetColorTargets());
    }

    private void UpdateColorSelectionVisuals(IReadOnlyList<(Button Button, Border Swatch)> targets)
    {
        foreach (var (button, swatch) in targets)
        {
            var isSelected = TryGetButtonColor(button, out var color) && AreSameColor(color, _selectedThemeColor);
            button.Classes.Set("swatch-button", true);
            button.Classes.Set("swatch-selected", isSelected);
            swatch.BorderThickness = new Thickness(0);
            swatch.Opacity = isSelected ? 1 : 0.9;
        }
    }

    private static bool TryGetButtonColor(Button? button, out Color color)
    {
        color = default;
        if (button?.Tag is not string colorText || string.IsNullOrWhiteSpace(colorText))
        {
            return false;
        }

        try
        {
            color = Color.Parse(colorText);
            return true;
        }
        catch
        {
            return false;
        }
    }


    private static bool ContainsColor(IReadOnlyList<Color> colors, Color target)
    {
        for (var i = 0; i < colors.Count; i++)
        {
            if (AreSameColor(colors[i], target))
            {
                return true;
            }
        }

        return false;
    }

    private static bool AreSameColor(Color left, Color right)
    {
        return left.R == right.R && left.G == right.G && left.B == right.B;
    }


    private static double CalculateBrushLuminance(IBrush? brush)
    {
        if (brush is ISolidColorBrush solidBrush)
        {
            return CalculateRelativeLuminance(solidBrush.Color);
        }

        return CalculateRelativeLuminance(Color.Parse("#FF020617"));
    }

    private static double CalculateBitmapAverageLuminance(Bitmap bitmap)
    {
        try
        {
            var sampleWidth = Math.Clamp(bitmap.PixelSize.Width, 1, 48);
            var sampleHeight = Math.Clamp(bitmap.PixelSize.Height, 1, 48);

            using var scaledBitmap = bitmap.CreateScaledBitmap(
                new PixelSize(sampleWidth, sampleHeight),
                BitmapInterpolationMode.MediumQuality);
            using var writeable = new WriteableBitmap(
                scaledBitmap.PixelSize,
                new Vector(96, 96),
                PixelFormat.Bgra8888,
                AlphaFormat.Premul);
            using var framebuffer = writeable.Lock();

            scaledBitmap.CopyPixels(framebuffer, AlphaFormat.Premul);

            var rowBytes = framebuffer.RowBytes;
            var byteCount = rowBytes * framebuffer.Size.Height;
            if (byteCount <= 0 || framebuffer.Address == IntPtr.Zero)
            {
                return CalculateRelativeLuminance(Color.Parse("#FF020617"));
            }

            var pixelBuffer = new byte[byteCount];
            Marshal.Copy(framebuffer.Address, pixelBuffer, 0, byteCount);

            double luminanceSum = 0;
            var pixelCount = 0;
            for (var y = 0; y < framebuffer.Size.Height; y++)
            {
                var rowOffset = y * rowBytes;
                for (var x = 0; x < framebuffer.Size.Width; x++)
                {
                    var index = rowOffset + (x * 4);
                    var alpha = pixelBuffer[index + 3] / 255d;
                    if (alpha <= 0.01)
                    {
                        continue;
                    }

                    var blue = (pixelBuffer[index] / 255d) / alpha;
                    var green = (pixelBuffer[index + 1] / 255d) / alpha;
                    var red = (pixelBuffer[index + 2] / 255d) / alpha;

                    red = Math.Clamp(red, 0, 1);
                    green = Math.Clamp(green, 0, 1);
                    blue = Math.Clamp(blue, 0, 1);

                    luminanceSum += CalculateRelativeLuminance(red, green, blue);
                    pixelCount++;
                }
            }

            return pixelCount > 0
                ? luminanceSum / pixelCount
                : CalculateRelativeLuminance(Color.Parse("#FF020617"));
        }
        catch
        {
            return CalculateRelativeLuminance(Color.Parse("#FF020617"));
        }
    }

    private static double CalculateRelativeLuminance(Color color)
    {
        return CalculateRelativeLuminance(color.R / 255d, color.G / 255d, color.B / 255d);
    }

    private static double CalculateRelativeLuminance(double red, double green, double blue)
    {
        var linearRed = ToLinearRgb(red);
        var linearGreen = ToLinearRgb(green);
        var linearBlue = ToLinearRgb(blue);
        return (0.2126 * linearRed) + (0.7152 * linearGreen) + (0.0722 * linearBlue);
    }

    private static double ToLinearRgb(double value)
    {
        return value <= 0.04045
            ? value / 12.92
            : Math.Pow((value + 0.055) / 1.055, 2.4);
    }

    private void OpenSettingsPage()
    {
        if (_isComponentLibraryOpen)
        {
            return;
        }

        if (_isSettingsOpen)
        {
            return;
        }

        _isSettingsOpen = true;
        UpdateAdaptiveTextSystem();
        ApplyWallpaperBrush();
        ApplyTaskbarActionVisibility(GetCurrentTaskbarContext());
        SettingsPage.IsVisible = true;
        SettingsPage.Opacity = 0;

        UpdateWallpaperPreviewLayout();

        Dispatcher.UIThread.Post(() =>
        {
            if (!_isSettingsOpen)
            {
                return;
            }

            SettingsPage.Opacity = 1;
        }, DispatcherPriority.Background);
    }

    private void CloseSettingsPage(bool immediate = false)
    {
        if (!_isSettingsOpen)
        {
            return;
        }

        _isSettingsOpen = false;
        UpdateAdaptiveTextSystem();
        ApplyWallpaperBrush();
        ApplyTaskbarActionVisibility(GetCurrentTaskbarContext());

        if (immediate)
        {
            SettingsPage.Opacity = 0;
            SettingsPage.IsVisible = false;
            return;
        }

        SettingsPage.Opacity = 0;

        DispatcherTimer.RunOnce(() =>
        {
            if (_isSettingsOpen)
            {
                return;
            }

            SettingsPage.IsVisible = false;
        }, TimeSpan.FromMilliseconds(200));
    }

    private void InitializeSettingsIcons()
    {
        const IconVariant variant = IconVariant.Regular;

        if (WallpaperPlacementSettingsExpander is not null)
        {
            WallpaperPlacementSettingsExpander.IconSource = new FluentIcons.Avalonia.Fluent.SymbolIconSource
            {
                Symbol = Symbol.Image,
                IconVariant = variant
            };
        }

        if (GridSizeSettingsExpander is not null)
        {
            GridSizeSettingsExpander.IconSource = new FluentIcons.Avalonia.Fluent.SymbolIconSource
            {
                Symbol = Symbol.Grid,
                IconVariant = variant
            };
        }

        if (ThemeColorSettingsExpander is not null)
        {
            ThemeColorSettingsExpander.IconSource = new FluentIcons.Avalonia.Fluent.SymbolIconSource
            {
                Symbol = Symbol.Color,
                IconVariant = variant
            };
        }

        if (StatusBarClockSettingsExpander is not null)
        {
            StatusBarClockSettingsExpander.IconSource = new FluentIcons.Avalonia.Fluent.SymbolIconSource
            {
                Symbol = Symbol.Clock,
                IconVariant = variant
            };
        }

        if (LanguageSettingsExpander is not null)
        {
            LanguageSettingsExpander.IconSource = new FluentIcons.Avalonia.Fluent.SymbolIconSource
            {
                Symbol = Symbol.Earth,
                IconVariant = variant
            };
        }

        UpdateThemeModeIcon();
    }

    private void UpdateThemeModeIcon()
    {
        if (ThemeModeSettingsExpander is null)
        {
            return;
        }

        ThemeModeSettingsExpander.IconSource = new FluentIcons.Avalonia.Fluent.SymbolIconSource
        {
            Symbol = _isNightMode ? Symbol.WeatherMoon : Symbol.WeatherSunny,
            IconVariant = IconVariant.Regular
        };
    }
}